Lumbar and Sacral Plexus

Question 1

From what ventral rami is the lumbar plexus formed?

Answer 1

Ventral rami L1-L4

Question 2

Within what muscle is the lumbar plexus?

Answer 2

Psoas major

Question 3

What are the branches of the lumbar plexus?

Answer 3

Iliohypogastric
Ilioinguinal
Genitofemoral

Question 4

What does the iliohypogastric serve?

Answer 4

Muscles and skin of abdominal wall

Question 5

What does the ilioinguinal serve?

Answer 5

Passes through the superficial inguinal ring

Muscles of the abdominal wall and skin of scrotum and labia majora

Question 6

From where does the genitofemoral originate?

Answer 6

Lumbar plexus - Pierces anterior surface of psoas major

Question 7

What are the branches of the genitofemoral?

Answer 7

Genital Branch

Femoral Branch

Question 8

Of the genitofemoral branch, what does the genital branch serve?

Answer 8

Cremaster, skin of scrotum/labia and upper thigh

Question 9

Of the genitofemoral branch, what does the femoral branch serve?

Answer 9

Skin of upper thigh

Question 10

What are the branches of the anterior division of the lumbar plexus?

Answer 10

Obturator

Accessory Obturator

Question 11

What are the branches of the posterior division of the lumbar plexus?

Answer 11

Lateral femoral cutaneous

Femoral Nerve

Question 12

From what ventral rami does the sacral plexus arise?

Answer 12

Ventral Rami L4-S3

Question 13

What are the components of the anterior division of the sacral plexus?

Answer 13

Tibial Nerve
Nerve to quadratus Femoris & Inferior Gemellus
Nerve to the Obturator inter us & Superior Gemellus
Pudendal

Question 14

What are the components of the posterior division of the sacral plexus?

Answer 14

Common Fibular
Superior Gluteal
Inferior Gluteal
Nerve to Pirifomis
Posterior femoral cutaneous